Entomology Research Unit

Palayamkottai, India

Entomology Research Unit

Palayamkottai, India

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Baskar A.,S B K College | Ambrose D.P.,Entomology Research Unit | Tirumurugaan K.G.,Madras Veterinary College | Fleming A.T.,Loyola College
Journal of Advanced Zoology | Year: 2012

Rhynocoris fuscipes Fabricius lays light brown eggs in batches. Eggs are glued to each other and to the substratum with cementing material. The highest numbers of fecundities were observed from Kanchipuram Semiarid Zone was 69.72 ±11.29 and eggs hatchability in 91.85%. The longest developmental periods are recorded from Kanchipuram Semiarid Zone I instar to V instar was 41.87 ± 2.89 days and the longevity of the male (65.92 ± 18.21) was shorter (91.72 ± 19.82) than that of the female. The shortest preoviposition period was 14.41 ± 4.13 days in Rajapalayam Tropical Rainforest and the male and female sex ratio was 1:1. The highest innate capacity of natural increase (rc) was 0.080 with a gross reproduction rate (mx) of 211.8 females per female from Kanchipuram Semiarid Zone. The average mean length of generation (Tc) was 72.21 days in Tiruvannamalai Scrub Jungle. Individuals of R. fuscipes collected from three different ecological habitats viz., Rajapalayam Tropical Rainforest, Tiruvannamalai Scrub Jungle and Kanchipuram Semiarid Zone exhibited pronounced diversities in their oviposition pattern, hatchability, incubation and stadial periods, nymphal mortality, adult longevity, sex ratio and life table parameters were analysed. These diversities are considered a specially adapted biological function collectively called ecotypism.


Nagarajan K.,Entomology Research Unit | Ambrose D.P.,Entomology Research Unit
Pakistan Journal of Biological Sciences | Year: 2013

The reduviid predator, Rhynocoris fuscipes (Fabricius) (Heteroptera: Reduviidae) is a potential predator inhibiting diverse agroecosystems and preying upon about 50 minor as well as major insect pests. The prey approaching behaviour of R. fuscipes (Fabricius) to the hexane extracts of insect pests viz., Helicoverpa armigera Hubner, Spodoptera litura (Fabricius), Achaea janata Linnaeus, Dysdercus cingulatus Fabricius and Mylabris indica Thunberg was assessed in Y-shaped olfactometer in terms of Excess Proportion Index (EPI). Ether in hexane fraction extracts of S. litura stimulated higher rostral protruding activity (6.53±1.56 min) than that of H. armigera (4.61±1.29 min) followed by A. janata (3.17±1.11) and D. cingulatus (2.95±1.12 min). The lowest response was observed to the hexane extract of M.indica (1.30±0.63 min).The order of excitement in behavioral response of R. fuscipes to the tested body extract of five insect pests was ranked as follows: S. litura>H. armigera>A. janata>D. cingulatus>M. indica. Thus the present study clearly reveals the host preference of R. fuscipes to the taxonomically diverse insect pests. © 2013 Asian Network for Scientific Information.


Mukherjee P.,Zoological Survey of India | Ambrose D.P.,Entomology Research Unit | Saha G.K.,University of Calcutta | Bal A.,Zoological Survey of India
Zootaxa | Year: 2014

A new genus, Neoschidium was erected with the type genus, Neoschidium phasma (Distant). It was earlier described under Ghilianella Spinola 1850 as G. phasma Distant and later under Schidium Bergroth 1916 as Schidium phasma (Distant) by Bergroth (1916). Because it exhibits characters not only of Ghilianella and Schidium but also intermediate specific characters that are not found in both the genera, the type genus Neoschidium phasma (Distant) is redescribed with additional taxonomic details, morphometrics, and illustrations. It is also recorded for the first time from India. Copyright © 2014 Magnolia Press.


Ambrose D.P.,Entomology Research Unit | Arockia Lenin E.,Entomology Research Unit | Angeline Kiruba D.,Government College of Technology, Coimbatore
Zootaxa | Year: 2014

Available mitochondrial DNA sequences viz., 16S, Cyt b, Cyt c oxidase subunit - I, and Cyt c subunit-like - I gene of Rhynocoris (Kolenati) species were subjected to phylogenetic analysis to understand the intrageneric and intraspecific variations and the role of geographical isolation on speciation; using CLUSTAL W in MEGA version 5.1. This analysis includes fifteen species and four ecotypes of R. kumarii Ambrose and Livingstone and three morphs of R. marginatus (Fabricius) from four countries viz., Canada, China, Korea, and South Africa. The pairwise genetic distances were calcu-lated and phylograms were constructed using Maximum Likelihood, Maximum Parsimony, and Neighbor-Joining meth-ods. These preliminary analyses not only demarcated the fifteen species of Rhynocoris, the four ecotypes of R. kumarii, and the three morphs of R. marginatus, but also revealed phylogenetic relationships and the role of geographical isolation and polymorphism on speciation Copyright © 2014 Magnolia Press.


Baskar A.,Sbk College | Ambrose D.P.,Sbk College | Ambrose D.P.,Entomology Research Unit | Tirumurugaan K.G.,Sbk College | Tirumurugaan K.G.,Madras Veterinary College
Journal of Entomological Research | Year: 2012

Individuals of Rhynocoris kumarii collected from three different ecological habitats viz., Rajapalayam Tropical Rainforest, Tiruvannamalai Scrub Jungle and Kanchipuram Semiarid Zone exhibited pronounced diversities in their oviposition pattern, hatchability, incubation and stadial periods, nymphal mortality, adult longevity, sex ratio and life table parameters. These diversities are considered a specially adapted biological function collectively called ecotypism.


Ambrose D.P.,Entomology Research Unit | Nagarajan K.,Entomology Research Unit | Ganesh Kumar A.,Entomology Research Unit
Journal of Entomological Research | Year: 2013

Harpactorine reduviid, Rhynocoris marginatus (Fabricius) exhibited type II Holling's curvilinear functional response to teak skeletonizer, Eutectona machaeralis Walker. The predator's attack rate increased with the increase in prey density. The maximum predation represented by 'k' values was observed as 4.16. But the highest and lowest attack ratios (y/x) (0.69 and 0.52) were obtained at 1 and 8 prey /predator density. Positive correlations were obtained between the prey density and prey killed, but negative correlations were obtained between the prey density and searching time of the predator. At high prey density, predator spent less time in searching, therefore it spent more time in handling, whereas at low prey density predator spent more time in searching than handling. However, handling time varied due to factors such as rate of pursuit of predator and prey escape or prey capture success.


Mukherjee P.,Zoological Survey of India | Ambrose D.P.,Entomology Research Unit | Hassan M.E.,Zoological Survey of India | Biswas B.,Zoological Survey of India
Zootaxa | Year: 2015

A new species of Stenolemus Signoret, 1858, Stenolemus annulatus sp. Nov. (Reduviidae: Emesinae) is described from India. This new species is closely related to S. susainathani Wygodzinsky from Nilgiri Hills, South India and S. larat Wygodzinsky from Moluccas, Larat, by sharing common characteristics such as the ratio of distance between eyes and their width, long antennal first segment, slightly elevated postocular region of head and sharply divided pronotum into three parts, but can be easily separated by the following diagnostic characteristics: pronotum with petiole about as long as forelobe and 1.3 times shorter than hindlobe, first antennal segment with five annulations, rostrum creamy white and luteous at apex, basal and lateral areas of second segment; hind lobe of pronotum with 1+1 submedian conical rounded projections; forecoxa shorter than hind lobe of pronotum, foretibia with one subbasal and one submedian annulation and hind femora reaching apex of forewings. A key to Indian species of the genus Stenolemus is given. Copyright © 2015 Magnolia Press.


Sivarama Krishnan S.,Entomology Research Unit | Ambrose D.P.,Entomology Research Unit
Zootaxa | Year: 2010

Two species of Endochus Stål, 1859, E. albomaculatus Stål and E. merula Distant, were recorded for the first time from India. They are redescribed, together with the genus, with additional taxonomic details and illustrations. Copyright © 2010 Magnolia Press.


PubMed | Entomology Research Unit
Type: Journal Article | Journal: Pakistan journal of biological sciences : PJBS | Year: 2014

The reduviid predator, Rhynocoris fuscipes (Fabricius) (Heteroptera: Reduviidae) is a potential predator inhibiting diverse agroecosystems and preying upon about 50 minor as well as major insect pests. The prey approaching behaviour of R. fuscipes (Fabricius) to the hexane extracts of insect pests viz., Helicoverpa armigera Hubner, Spodoptera litura (Fabricius), Achaea janata Linnaeus, Dysdercus cingulatus Fabricius and Mylabris indica Thunberg was assessed in Y-shaped olfactometer in terms of Excess Proportion Index (EPI). Ether in hexane fraction extracts of S. litura stimulated higher rostral protruding activity (6.53 +/- 1.56 min) than that of H. armigera (4.61 +/- 1.29 min) followed by A. janata (3.17 +/- 1.11) and D. cingulatus (2.95 +/- 1.12 min). The lowest response was observed to the hexane extract of M. indica (1.30 +/- 0.63 min).The order of excitement in behavioral response of R. fuscipes to the tested body extract of five insect pests was ranked as follows: S. litura > H. armigera > A. janata > D. cingulatus > M. indica. Thus the present study clearly reveals the host preference of R. fuscipes to the taxonomically diverse insect pests.


PubMed | Entomology Research Unit and Zoological Survey of India
Type: Journal Article | Journal: Zootaxa | Year: 2015

A new species of Stenolemus Signoret, 1858, Stenolemus annulatus sp. nov. (Reduviidae: Emesinae) is described from India. This new species is closely related to S. susainathani Wygodzinsky from Nilgiri Hills, South India and S. larat Wygodzinsky from Moluccas, Larat, by sharing common characteristics such as the ratio of distance between eyes and their width, long antennal first segment, slightly elevated postocular region of head and sharply divided pronotum into three parts, but can be easily separated by the following diagnostic characteristics: pronotum with petiole about as long as forelobe and 1.3 times shorter than hindlobe, first antennal segment with five annulations, rostrum creamy white and luteous at apex, basal and lateral areas of second segment; hind lobe of pronotum with 1+1 submedian conical rounded projections; forecoxa shorter than hind lobe of pronotum, foretibia with one subbasal and one submedian annulation and hind femora reaching apex of forewings. A key to Indian species of the genus Stenolemus is given.

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